Pile cutting mechanism



y 1954 R. ADAMSON 2,679,265

PILE CUTTING MECHANISM Filed Sept. 29, 1953 2 Sheets-Sheet l INVENTOR.

%%www May 25, 1954 R. ADAMSON PILE CUTTING MECHANISM 2 Sheet-Sheet 2 Filed Sept. 29, 1955 FIG. 4

INVENITORQ ai Patented May 25, 1954 UNITED STATES PATENT OFFICE 3 Claims.

The present invention relates to pile cutting mechanism for velvet and plush weaving looms wherein the pile cutting knife is actuated by solenoids.

In a known form of plush weaving loom the pile cutting knife is mounted on a carrier which is reciprocated mechanically between guideways forming part of the loom bench. It is contemplated that the present invention may conveniently be applied to said conventional type of loom by removing the mechanical knife operating mechanism and substituting therefor the devices hereinafter described.

One object of the invention, whether applied in place of conventional or other mechanical devices in a known type of loom or incorporated in a new loom, has been to simplify the pile cutting mechanism and render it safer and more reliable in operation.

A further object of the invention has been to provide a pile cutting knife control mechanism producing simpler and more effective actuation of the knife and providing dependable stop means by which cutting movement of the knife is stopped effectively and with minimum impact and recoil. Thus, at the end of each cutting stroke the knife is properly positioned to receive the next thrust of the driving means.

Knife operating mechanism according to the present invention comprises in general a reciprocable knife carrier, a solenoid on each end of the bench which provides the path of movement of said carrier, switch means in the circuits of said solenoids, and actuating means including timing mechanism arranged and adapted to operate said switch means whereby said solenoids are alternately energized and deenergized. Furthermore. said apparatus includes shock absorbing and damping devices which reduce the velocity of the carrier near the end of its pile cutting run and limit the extent and violence of recoil resulting from impact of the carrier upon the fixed carrier stops.

A preferred embodiment of the invention is more fully described in the following specification as illustrated in the appended drawings wherein:

Figure l is a view in perspective showing diagrammatically the principal parts of a usual velvet or plush 100m including a conventional form of bench and a mechanically actuated pile cutting knife arranged in operative relation thereto;

Figure 2 is a diagram showing in perspective a pile cutting knife carrier with the actuating and control devices of the present invention applied thereto;

Figure 3, a diagram showing partly in various of the parts shown in Figure 2;

Figure 3A, a transverse section in the line T--T of Figure 3;

Figure 4, a diagrammatical fragmentary plan view, on enlarged scale, showing solenoid parts in relation to the knife carrier at one end of the loom bench; and

Figure 5, an enlarged fragmentary view in perspective illustrating details of the solenoid mounting and the knife carrier stopping and damping means at one end of the loom bench.

Referring to the drawings, the conventional type of loom illustrated in Figure 1 provides mechanical pile cutting knife actuating means including at each side of the loom crank A on the loom power shaft which imparts reciprocating endwise movement to rod B thus rocking the gear segment C to rotate drum D. The rope E wound on drum D is thus alternately pulled and released so that the knife H is reciprocated across bench G in synchronism with the loom shuttles, to cut the pile threads exposed thereto in a conventional manner.

As shown in Figure 2, the mechanism embodying the invention is indicated generally in full lines and in operative relation to a conventional form of loom bench G, knife H and loom fabric in process shown in dotted lines. The knife carrier K is conveniently in the form of a slidable rod or bar Figures 4 and 5 which slides endwise in a groove on the top of bench G formed by parallel guides J secured thereto. As seen in Figure 5, the knife H is secured to end portions of a pair of brackets 2| which are mounted in spaced relation on carrier K and extend laterally therefrom.

Said carrier K is actuated by solenoid devices I and 2 conveniently mounted on shelves 3 and 4, respectively, at opposite ends of bench G, as shown more clearly in Figure 2. The cam 5 on power shaft 20 of the loom actuates a single pole double throw switch 6 to alternately open and close the circuits of said solenoids during each revolution of said shaft 20 and in synchronism with reciprocating movements of the loom shuttles. A power line 8 supplies current to said solenoid circuits through a control panel 1 which advantageously includes a hand operated switch, not shown.

The arrangement of the knife carrier K in relation to the solenoids I and 2 is such that the plungers 9 and H! thereof moving against resistance of the biasing or retracting springs I6 strike or thrust the knife carrier alternately in opposite directions to drive it across bench G, thus at each elevation run bringing knife H into pile cutting operation against and across the pile threads as the woven fabric advances in the weaving process.

As shown in Figure 5, the brackets 21 on knife carrier K are provided with transversely disposed upwardly extending ridges ll substantially V- shaped in cross-section and presenting longitudinally extending oblique faces which cooperate with the substantially cylindrical or rounded surface portions .of the free end of spring l2 ;in a manner and for purposes hereinafter set forth. The opposite end of said spring I2 is secured to guide bar J in such position that, when knife carrier K near the end of its pile cutting run, the leading oblique face of ridge 1 l engages and then rides under the rounded end of said spring 12 which in effect thus acts in ,part as a-shock absorber to materially reduce the velocity of carrier K just before its leading end comes against-the fixed stop plate l3. This also brings the rounded end or surface of said spring l2 into position to be engaged by the other or trailing oblique face of ridge -ll and thus to limit or reduce the extent of rebound or recoil of said carrier 1K when its leading end strikes said stop I3. Thus, in operation, said spring 52 and said ridge l l cooperate both to reduce the velocity of carrier K near the end of its pile cutting run and to limit reooil thereof after its impact upon stop 13.

As shown more clearly in Figure 5, the plunger ll! of solenoid 2 (and this applies as well plunger-90f solenoid i at the opposite end of bench G) carries at. its inner end a striking piece "or plate Mhaving a depending portion which, when-solenoid 2 is energized with switch 5 by cam'5 against resistance of springEA, strikes carrier K thus forcing it along with knife across the bench G toward plunger 9 of sole- =noid I. -When the latter is energized with the next actuation of switch 6 by said spring 5A,

after release from cam 5, Figure 3, a similar striking piece onplunger 9 impels carrier K back to its initial position and in readiness for the next run in the opposite direction.

"Theloorn parts are so synchronized that each 1" :o'f said solenoids l and 2 is deenergized when the :other is energized. .Also, as soon ;as solenoid for example, is inert, plunger ilfi is moved .to retracted position by said biasing springs -l teach of-which hasone end attached to a plate l5:car- 4.

ried-at the forward end of said plunger in and ithe other end .anchoredto a bracket 1? :f xed to Endwise pile cutting inovernentof carrier i'FigureS, towards'plunger .IG produced. as above the closing of [carrier is nearing -its :ol di s .a

absortin moa srposltiono o o h v itv :0 sai loar t oribo o the next pile cutting operation of said carrier K. However, as carrier K approaches its end position, said ridge H slides under the end of spring 42 which, in yieldingly resisting displacement upwardly absorbs a portion of the energy and reduces the velocity of the moving parts and thus the extent of recoil as said carrier K strikes said stop plate l3. Furthermore, spring (2 tends to damp chattering or vibrations produced by said impact, in part reason of the friction between spacing blocks 22 on the under side of said brackets as said blocks bear against adjacent top surface portions of guide bars J with the downward pressure exerted by the face end or spring !2 on said brackets 2| and blocks 22.

What I claim is:

,1. Inapparatus for actuating and controlling operation of the pile cutting mechanism in a loom of the velvet or plush weaving type, the combination of a pile cutting knife carrier mounted fo lon tud n io i rooot s m eme a on b oh ioh end ac ss the p t o thoni threads .of a double fabric as the latter is advanced through the loom, a carrier actuatingassembly at each end of said bench including a so en id ha ing a-s lu so no m l sp b sed in retr t p s ti when th s lenoi 5.51 n size a ar an ed it one end o o -a end of said knife carrien and means for energizing each of said solenoids alternately with the other-including a single pole double throw switch in circuit with said solenoids and normally spring biased to close the circuit prone of P11 121 and m an o Pe i d ca l a tuatin ai s i h to .open said circuit and close the circuit offibe other o s lon id -2. In apparatusfor actuating and controllin o r o of the P lo cutting .moohei ismi a loo of the velvet or plush weaving type, t he combination of a pile cutting knife carrier mounted for lon din re oc t v men a on .a bench whichextends across the path of the ile threads of a double fabric as the latter is advanced through the loom, acarrier actuating assembly at each end of sai d bench, and carrier stopping means atea ch end of said bench includnso fix s o p it n i th pa o m vement of the carrier to limit the extent thereof, a buf r-s ng, having azfreo ounde end a o si e o a d pa movem n o th oa in or and a projection extending from said carrieni n p s n t g g a d d u de a unde ondasai es t o sai s rin wh n aid t rm n o i o a d t be en a b sai u id don to r st tain oi a i -asa st r oo ,af ih il as eas ed terminal position against said fixed stop.

-..3- ,Appa a ac o i t c i 1 a n- .iiXeds o -no t w o m a sto the pile cuttin movement of said carrier, shock impact thereof on said stop. and damping means positioned to reducerccoil zaftersimpao oisaid oerrio o sa t No references cited. 

